Securely transport confidential documents, money, and other materials—these bags show clear signs of tampering if they have been opened. Unlike other bags with unreliable adhesives and burdensome keys, these are sealed with locking pins or seals. All have serial numbers on the bag or seal, so you can verify that the receiver got the correct bag. Made of polyethylene or PVC, these bags are strong enough to resist tears and punctures. They also repel water, oil, and solvents to keep contents dry.